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Proceedings Paper

Reference-free impedance-based crack detection in plate-like structures
Author(s): Minkoo Kim; Eunjin Kim; Hyunwoo Park; Hoon Sohn
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Paper Abstract

Impedance-based structural health monitoring (SHM) has been of great interest to many researchers. In general, conventional impedance-based damage detection techniques identify damage by comparing "current" impedance signals with "baseline" ones obtained from the pristine condition of a structure. However, structures in field are often subject to changing environmental and operational conditions that affect the measured impedance signals and these ambient variations can often cause false-alarms. In this paper, a new reference-free impedance method, which does not require direct comparison with baseline impedance signals, is employed for crack detection in a plate-like structure. This method utilizes a single pair of PZTs collocated on the both surfaces of a structure to detect mode conversion caused by the presence of crack damage. A new statistical damage classifier is developed for instantaneous damage classification based on decomposed impedance signatures containing mode conversion information. Experimental tests, particularly under varying temperature and loading conditions are presented to demonstrate the applicability of the proposed method to crack detection.

Paper Details

Date Published: 8 April 2010
PDF: 12 pages
Proc. SPIE 7650, Health Monitoring of Structural and Biological Systems 2010, 76500Q (8 April 2010); doi: 10.1117/12.848291
Show Author Affiliations
Minkoo Kim, KAIST (Korea, Republic of)
Eunjin Kim, Dong-A Univ. (Korea, Republic of)
Hyunwoo Park, Dong-A Univ. (Korea, Republic of)
Hoon Sohn, KAIST (Korea, Republic of)

Published in SPIE Proceedings Vol. 7650:
Health Monitoring of Structural and Biological Systems 2010
Tribikram Kundu, Editor(s)

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